The question of whether a tree makes a sound when it falls in a forest, and there is no one around to hear it, is a philosophical one that has been debated for quite some time.   The traditional view is that sound is a perceptual experience that requires an observer to hear it. In this view, if there is no observer present to perceive the sound waves created by the falling tree, then the sound does not exist.   On the other hand, from a scientific standpoint, sound is defined as vibrations that travel through a medium, typically air, and can be detected by an auditory system. In this sense, the falling tree would create sound waves regardless of whether or not there is an observer present to hear them.  Ultimately, it comes down to how one defines sound. If sound is defined as a perceptual experience, then it requires an observer. If it is defined as physical vibrations, then the falling tree would indeed produce sound waves, regardless of whether or not there is someone to perceive them.